The older sister has POA of medical and finances. According to the eldest sister my younger sister has dementia. The younger sister suffered a bad head injury quiet some time ago and as everyone knows with these injuries people change. Fast forward some 23 years or more now the older sister has control over her and I believe she is being abused physically emotionally and definitely financially. What can I do to help? I'm willing to become the care taker but the older sister does not want to let go. How can I find out if what she has is legal? Cant afford a huge legal battle but willing to fight for what is right for my younger sister.